Radial drilling machine



G. A, GRAY, Jr. i RADIAL DML-LING MAGHINB. No, 97,9081 Patent-ed Deo. 14, 1869.

l shaft J,through gearing K K', The arm C is elevated and depressed by powenby enonen A. Acan Y, J a., [or '.oIN'o INNATI, 'oHIo.

Letters Potent N f, 97 ,908,` dated December 14, 1869.-

mpnovnn RADIAL MILLING-MACHINE.

The Schedule referred to lx1- these Letters Patent and making pax-tof the same.

To all whom it may concern.-

Be it known that I, GEORGE A.` GRAY, Jr., of Cincinnati, Hamilton county, State of Ohio, have invented -certain new and useful Improvements in Radial Drillspecification.

-My invention relates to that class of drilling-ma- Vchines which4 has a radially-adjustable arm,i n which' the drill-spindle is journaled; and consists, iirst,y in va peculiar construction of the column. to4 which the swinging arm is secured, in connection witha peculiar H device for attaching thesame to the bed-plate of the machine; second, ingtheformation of the bed-plate, in connection with'the devices for rmly securing the column and arm in any required position; third, in an `improved,and simple device forsec'uring the drillingtable on which the work rests, to the bed-plate of the .macliine. E In the accompanying drawings-4 Figure 1 is a perspective view -of a drilling-machine 'f embodying my improvements. 1 e `Figure 2 is an axial section of the parts ofthe machine which enibod therest. ,2- I A is the bed-plate of the machine, B, the column; and C, the swinging arm, to which the drill-spindle is attached. V-

The spindle D is journaled in the Vframe E,'which my improvements, detached from can be adjusted to drill at any angle. The frame E, and the slide 'or saddleiF, to which it i is attached, are ldesigned to be adjusted along the arm 0,;by means yof the screw G, the gearing by which thedrill is driven, sliding along the driving-shaft H. The arm C carries a pair-ot' mitre-gears, I, which slide' on--a feather up and'down their driving-shaft L.

The power is communicated from central drivingmeans of screw M working through a half nut, N, in the socket c of the arm, a groove'being'planed in the column B, in which the screw fits and rests.

A gear-wheel, 0, is iitted to the screw M, for they p'urposeof driving the same. v

The swinging lever l? carries two pinions, geared together, one ot' which is also geared to the wheel O.

`Each gof these' pinions is arranged to gear'with the wheel Q on the shaitJ when thrown into gear by 1ever Pthe `connection with one serving to run the arm up,- aiid with the other, dowmx When between the two, -the arm -(l remains at rest. The has 4a socket, c, which clamps on the column, forsecuriug the same at any height to which it may have been adjusted, bymeans of bolts R. The screw 4M serves to prevent the arm from turning on the column B. This column, as shown, is cylindrical, in order that it may he easily finished to size, and it is connected to the bed-plate A, on which it swivels,

by the following device: l

.. The column isbored outfor a considerable' distance J`from the bottom anch b, and a cylindrical sleeve, S,

is closely Itted to the bore, as shown, the sleeve being permanently secured to the bed-plate by bolts T. The lowerfacc of the anch b is faced ofi`, to fit acc-uf rately against theplaned face of the bed-plate A.` lt

will be seen, that by the provision of the' sleeve S,

the column is preserved in a. vertical position against the pressnre of the drill, even when not additionally lsecured', and the column is retained in, its position on the bed-plate; and also, that the lower part of the column or base is materially strengthened.

-To rigidly secure the column in any required position, l provide the bol/ts U. The ordinary device for connecting a swivelling part of a machine to a station-` ary one, is a T- shaped 'groove inthe stationary part, in which the bolt-heads tit and connect. As itis neat to impossible to employ this device to connect the column B to the bed-plate A, owing to the diiiic'ulty of turning ont the T- groove at one end of so large a plate, I 4have devised the following substitute:

A plain groove, a, is'v provided -in the plate A, for theheads of. the bolts U, but ythe heads do not fit the groove, and the 'groove is not turned or otherwise finished,

The fla-uch s of the sleeve. S, is made of such asize as to projectover the groove a, as shown, and against the lower face of this flanch, which is, of course, faced off, the bolts are held,

fitted closely to the ila-uch s, asy shown. p y

They fit closely in the holes provided for them in the anch b, and are fitted with tightening-nuts u.

4 V is the drilling-table, To provide against the necessity of bolt-heads for holding this to the bed, which would project, be in the way, and catch dirt, I have designed the following connection, which is simple,

cheap, quite effective, and permits of a smooth, pleas- .y

ing iinish being given to the base of thc table.

The column 'v of the' table is cast hollow, as shown, and has a diaphragm or partition, e', cast within it, at a suiiicient distance below the top of the table to form a chamber for 'the reception of chips, clearance ot'- arm, am.'

Bymeans of the large bolt W, which passes through this partition c', the head shouldering against the same,

as shown, the table Vis connected to the bed-plateA.

I claim hereinv as new andof my invention,

The Shanks of the bolts' may he square, to prevent turning, and are 3. In combination wtlrthebed-plate A and bolt W the d1illingtableV, constructed as described.

In testimony of which invention, I hereunto set my e. A. GRAY, Jr.

Witnesses:

CEAS. E. CALLAHAN, GEO. W. EBBIGHT. 

